Drafting-table



V. LAURI.

DRAFTING TABLE.

APPLICATION FILED mzc. 6. 192g.

. 1 3 1 471 PatentedJune 14, 1921.

awuewtoz Vaim .L aun,

VAI1\TO LAURI, OF SEATTLE, WASHINGTON.

DRAFTING-TABLE.

Specification of Letters Patent. Patented J 11116 14;, 1921.

Application filed December 6, 1920. Serial No. 428,572.

To all whom it may concern:

Be it known that I, VAINO LAnnI, a subject of Finland, residing at$eattle, 1n the county of King and State of lVashington, have invented acertain new and useful Improvement in Drafting-Tables, of whlch thefollowing is a specificatlon.

My invention relates to improvements in drafting tables and the ob ectof my nvention is to provide a drafting table having a top which can beraised or lowered with facility and which is automatically locked in theraised position at any desired angle.

Another object is to provide a draftlng table with a top havingcylindrical rollers disposed under and at both ends thereof whereby aroll of drawing paper, passing over-the top of said table, may be woundfrom one to the other of said rollers.

A further object is to provide novel looking means for securing the endsof the drawing paper roll within said rollers.

'A still further object is to provide a drafting table thatissubstantial and durable 1n construction, simple and comparativelyinexpensive to manufacture and which may be readily dismantled forshipment.

With the above and other ObJGCtS in veiw which will appear as thedescription proceeds the invention consists of the novel construction,adaptation, arrangement and combination of parts hereinafter describedand claimed.

I accomplish these objects by devices illustrated in the accompanyingdrawings, wherein- Figure 1 is a view in side elevation of a draftingtable embodying the features of my invention; 7

Fig. 2 is a view in front elevation of the same;

Fig. 3 is a fragmentary view in central transverse vertical section,-showing the top in raised position; 1

Fig. 4c is a detail view in perspective of one of the rollers; a

Fig. 5 is an enlarged fragmentary view in transverse vertical sectionshowing the mean of securing the ends of the roll of drawing paperwithin the rollers; I

Fig. 6 is a detail View in perspective of one of the locking pawls forsaid rollers;

and

Fig. 7 is a fragmentary view in perspective showing the operative end ofthe trip spaced apart relation by a bar 12substan-- tially as shown. Abifurcated bracket 13 is centrally secured at its lower end to the bar12.

The bifurcated supports 10 and 11 comprise solid members 14 and hollowmembers 15 for the purpose hereinafter set forth.

A shelf 16 is detachably secured to the up per ends of the members 14and 15 and a drawer 17 is slidably mounted between said members belowand adjoining said shelf.

Superimposed on the said side members is a top 17 comprising arelatively thin working board 18 having cleats 19 and 20 secured to theunderside thereof adjacent to the outer end portions. Concave endmembers 21 and 22 are fixedly secured to the outer ends of the board 18forming compartments 23 and 24: in which rollers 25 and 26 arerotatively mounted.

Said rollers are substantially cylindrical in shape and are cut away toreceive segmental members 27, the peripheries of which are held inconcentric alinement with said rollers by springs 28 the ends of whichare secured to said rollers and to said segmental members.

Notches 29 are provided in said segmental members and spaces 30 are leftbetween said segmental members and rollers. Locking pawls 31 arepivotally mounted on the end members 21 and 22 as at 32 and their upperends are adapted to engage the notches 29.

The lower portions of said pawls are bent to form shoulders adapted toabut against the lower edge of the end members 21 and 22 when in theengaged position. The lower ends of said pawls are provided with notches33 and grooves 3% extending therefrom.

Rod springs 35 are secured to the cleats 19 and 20 and have shoulders 36formed on the outer end portions thereof. The outer ends of said rodsprings are arranged to seat within the notches 33 to hold said pawls inthe engaged position and the shoulders 36 are adapted'to slide withinthe grooves 34 and hold said pawls in the disengaged position as clearlyshown in Fig. 5 of the drawings.

It will be obvious that when the pawls 31 are held in engagement withthe notches 29 the slits 87, between the rollers 26 and the segmentalmembers 27, will be forced open by turning said rollers in a counterclockwise direction.

The slits 37 are adapted to register with apertures 38 and 39 providedin the top 18 through which the drawing paper 40 is arranged to pass.-When the slits 37 are opened the ends of the drawing paper 40 areinserted therein and the pawls 31 are released to the dotted positionshown in Fig. 5. The ends of the paper will be clamped in the slits 37by the released tension of the springs 28 and the drawing paper may befreely wound from one to the other of said rollers.

The top 17 is pivotally secured to the side supports by hinges 41fastened to the cleat 19. The hinges 41 are concentric with toothedsectors 42 which are hingedly secured to the cleat 20 as at 43 and arearranged to move within the hollow members 15 when the top 17 is openedand closed as shown in Figs. 1 and 3.

Right angle springs 44 are secured to the upper ends of the members 15as at 45, the inner ends of which are adapted to engage the teeth on thesectors 42. A trip rod 46 is mounted in suitable bearings within saidside supports having a thumb nut 47 disposed on its operative end. Therod 46 is also provided with shoulders 48 which are adapted to engagethe springs 44 when revolved and throw same out of engagement with theteeth on the sector 42 permitting the top 17 to be lowered.

The bifurcated side supports 10 and 11 together with the bifurcatedbracket 13 are adapted to serve as a rack for holding rolls of drawingpaper, etc. I

It will be seen that the table may be readily dismantled for shipment byremoving the pins in the ends of the bar 12, and removing the shelf 16and top 17.

From the foregoing description taken in connection with the accompanyingdrawings, the advantages of the construction and of the method ofoperation of my drafting table will be readily apparent to those skilledin the art to which the invention relates, but while I have describedthe principle of operation of the invention, together with the devicewhich 1 now consider to be the best embodiment thereof, I desire to haveit understood that the deviceshown is merely illustrative and that suchchanges may be made when desired as are within the scope of theinvention.

lVhat I claim is:

1. A drafting table comprising bifurcated side supports, a bar adaptedto retain said side supports in spaced apart relation, a bifurcatedbracket cent-rally mounted on said bar, a shelf mounted on the upperends of said supports, a top pivotally mounted on said supports havingtransverse apertures disposed at both ends thereof, rollers rotativelymounted in said top below and adjacent to said apertures, segmentalmembers disposed in angular grooves within said rollers, springsconnecting said rollers and segmental members adapted to hold saidsegmental members against one wall and :away from the opposite wall ofsaid angular grooves, locking pawls pivotally mounted on said toparranged to engage notches in said segmental members, means forretaining said pawl in and out of engagement with said notches, toothedsectors plvotally .secured to said top adapted to slidably move withinhollow members of said side supports, and means for securing said topand sectors in a raised position.

2. A drafting table comprising bifurcated side supports, a bar adaptedto retain said side supports in spaced apart relation, a bifurcatedbracket centrally mounted on said bar, a shelf mounted on the upper endsof said supports,'a top pivotally mounted on said supports havingtransverse apertures disposed at both ends thereof, rollers rotativelymounted in said top below and ad- 'jacent to said apertures, segmentalmembers disposed in angular grooves within said rollers, sprlngsconnecting sa1d rollers and segmental members adapted to hold saidsegmental members against one wall and away from the opposite wall ofsaid angular grooves, locking pawls pivotally mountedon said toparranged to engage notches in said segmental members, rod springs mounted in said top having their outer ends arranged to engage notches in thelower ends of said pawls when same are in engagement with said segmentalmembers, shoulders'disposed on the outer end portions ofsaid bar springsarranged to engage grooves in said pawls when same are out of engagementwith sa1d segmental members, toothed sectors pivotally secured to saidtopadapted to slidably move within hollow members of said side supports,and means for securing said top end sectors in a raised position.

3. A drafting table comprising bifurcated side supports, a bar adaptedto retainsaid side supports in spaced apart relation, a

compartments therebetween, rollers rotatively mounted in saidcompartments below and adjacent to said apertures, segmental membersdisposed in angular grooves within said rollers, springs connecting saidrollers and segmental members adapted to hold said segmental membersagainst one wall and away from the opposite wall of said angulargrooves, lodking pawls pivotally mounted on said concave end membersarranged to engage notches in said segmental members, rod springsmounted in said cleats having their outer ends arranged to engagenotches in the lower ends of said pawls when same are in engagement withsaid segmental members, shoulders disposed on the outer end portions ofsaid bar springs arranged to engage grooves in said pawls when same areout of engagement with said segmental members, toothed sectors pivotallysecured to one of said cleats adapted to slidably move within hollowmembers of said supports, right angular springs secured to the upperends of said side supports having their free ends arranged to engage theteeth of said sectors, and a trip rod rotatively mounted in saidsupports having shoulders thereon arranged to engage said right angularsprings to throw same in and out of engagement with the teeth of saidsectors.

In witness whereof, I hereunto subscribe my name this 24th day ofNovember, A. D.

VAINO LAURI.

